基于可靠性的城市组团间运输通道优化方法

发布时间：2018-03-25 23:48

本文选题：交通工程　切入点：运输通道　出处：《中国公路学报》2017年02期

【摘要】：为了科学解决城市组团间运输通道优化问题,首先对传统美国公路局(BPR)函数进行改进,通过引入通行能力影响因子以及区分交通流类型的方法,建立了组团间运输通道的行程时间可靠性测算模型;其次构建以运输通道可靠性最大为上层模型,用户平衡最优为下层模型的双层优化模型,并设计模型求解算法;最后将理论方法应用到南京市组团间运输通道优化案例中。研究结果表明:基于改进BPR函数的可靠性测算方法更适用于高等级、中长距离路段可靠性的计算,能客观反映出组团间运输通道通行能力易受过境车流影响的特征;采用双层优化模型后,南京市组团间运输通道整体可靠性水平提升了约11%,其中,原有运输通道可靠性的差距明显降低,中心城区以及江宁区周边路段可靠性提高了约15%,有效解决了中心城区路段可靠性偏低的问题;新方案与原方案对比分析显示,新方案可靠性比原方案提高了约6%,路段流量降幅约为4%,新方案对提升道路可靠性效果更好,而原方案则更有利于路段流量降低。采用提出的方法有效缓解了路段可靠性分布不均,中心城区路段可靠性偏低的问题,能够为城市组团间运输通道优化方案决策提供理论依据。
[Abstract]:In order to solve the problem of optimizing transportation channels among urban groups scientifically, the traditional BPR function of Highway Administration of the United States is improved at first. By introducing the influence factor of traffic capacity and the method of distinguishing traffic flow type, The travel time reliability model of inter-group transportation channel is established. Secondly, a two-layer optimization model with the maximum reliability of transportation channel as the upper layer model and the user balance optimal as the lower level model is constructed, and the algorithm for solving the model is designed. Finally, the theoretical method is applied to the optimization of inter-group transportation channel in Nanjing. The results show that the reliability calculation method based on the improved BPR function is more suitable for the reliability calculation of high-grade and medium-long distance road sections. It can objectively reflect the characteristics that the capacity of inter-group transportation channels is susceptible to the influence of transit traffic flow. After adopting the two-layer optimization model, the overall reliability level of inter-group transportation channels in Nanjing has increased by about 11 percent, of which, The gap between the reliability of the original transportation channel and that of the central urban area and the surrounding sections of Jiangning District has been improved by about 15 percent, which effectively solves the problem of the low reliability of the central urban section. The comparison and analysis of the new scheme and the original plan show that, The reliability of the new scheme is about 6 times higher than that of the original scheme, and the flow of road sections is reduced by about 4 percent. The new scheme has a better effect on improving the reliability of roads. The original scheme is more conducive to the reduction of road flow. The proposed method effectively alleviates the problem of uneven distribution of road section reliability and low reliability of road sections in central urban areas. It can provide the theoretical basis for the optimal scheme decision of inter-group transportation channel.
【作者单位】：南京航空航天大学民航学院;
【基金】：国家自然科学基金项目(51508274) 江苏省自然科学基金项目(BK20140821)
【分类号】：U491.1

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